Controlling means for the fuel pumps in internal-combustion motors



Oct; 26 1926. 1,604,737

8. A. DE WAERN I CONTROLLING MEANS FOR THE FUEL PUMPS IN INTERNAL COMBUSTION MOTORS I Filed Nov. 50. 1925 Imvemibi 'ymigm Patented Get. 26, 1926.

UITE STA" BROR ALGOR DE \VAERN, OF'STO CKI-IOLM, SWEDEN, ASSIGNOR T0 J. & C. G. BOLINDERS MEKANISKA VERKSTADS AK'IIEBOLAG, 0F KAPLANSBACKEN 10, STOCKHOLM,

SXVEDEN.

CONTROLLING MEANS FOR THE FUEL PUMPS IN INTERNAL-COMBUSTION MOTORS.

Application filed November 30, 1923, Serial No.'677,814, and in Sweden July'G, 192 3.

The present invention refers to such con trolling means for the fuel pumps in internal combustion motors where, in addition to a cam disk or the like imparting a pumping action to the pump plunger, there is provided a device actuated by means of a governor driven by the motor, the said device thereby either entirely disconnecting the pump plunger from the cam disk so as to interrupt the pumping action, or regulating the magnitude of the movement imparted from the cam disk onto the plunger.

In arrangements of this type as heretofore used, the member thus controlling the pump plunger has been mounted in or on the cam disk itself. This has necessitated a rather complicated and, consequently, heavyrunning mechanical connection between the said member and the governor proper, such mechanical connection having also been sub-' jected to considerable wear.

Therefore, the main object of the present invention is to simplify the arrangement so as to thereby provide an exceedingly easyoperating and a correspondingly sensitive device capable of withstanding considerable wear.

The invention is principally distinguished by the member or members actuating the pump plunger for the control constituting a part separate from the cam disk, said part being preferably connected directly with the deflecting members of the governor.

The arrangement is preferably so devised that the member controlling the movement of the plunger is made in, the form of a sleeve, segment of a sleeve, or the like, which is slidably mounted on the shaft of the cam disk and adapted as to be displaced by the governor into the path of the pump plunger or any part connected therewith. Preferably, the shaft of the cam disk then at the same time forms the spindle of a centrifugal governor provided for effecting the control, andthe deflecting members of said governor are directly connected with the displaceable sleeve.

The annexed drawing illustrates by way of example an embodiment of the invention. Fig. 1 shows the arrangement in vertical section, and Fig. 2 is a view of the cam disk and the member actuated thereby.

1 designates a shaft journalled in the cas ing 2, and attached to this shaft is a cam rotatably mounted on the bell crank lever 4.

The bell crank lever 4; actuates the fuel plunger against the pressure of the spring 7. A centrifugal governor of known type is connected with its deflecting members 8 directly to a sleeve 9 adapted to be displaced on the shaft 1. The lower end of the said sleeve 9 is preferably'of conical shape and adapted to co-operate with the roller 5, as shown in the drawing.

The arrangement operates in the followmg manner:

When the shaft 1, which also forms the spindle of the centrifugal governor, rotates, the parts mounted on the shaft, that is to say the cam disk 3, the sleeve 9 and the governor weights 8 are brought with the said shaft in rotation thereof. By the pressure of the spring 7 the roller 5 is kept in contact with the cam disk 3 which then im-.

parts a rocking motion to the arm 4 and thus a reciprocating motion to the plunger 6. On deflection of the governor weights 8 the sleeve 9 is displaced downwards on the shaft 1, and in a certain position it will then contact with the roller 5 so as to remove the latter from the cam disk on a continued dis placement downwards, the roller being prevented from moving inwards toward the shaft 1 further than permitted by the sleeve 9. Thus the pump strokes will. be shortened, or they will cease entirely if the sleeve is displaced far enough to bring the roller 5 altogether out of contact with the cam disk 3.

As the roller 5 cannot bear against the sleeve 9 under a pressure more powerful than corresponding to the tension of the spring 7, the contact ceasing entirely during the plunger strokes, the load on the governor corresponding to said bearing will obviously be very inconsiderable, and practically has no influence on the sensitiveness of the governor.

If found suitable, it will of course be possible to arrange in place of the single roller 5, a plurality of such rollers rotating about the same shaft.

What I claim as new and desire to secure by Letters Patent of the United States of America is 2- 1. In combination, a drive shaft, a pump actuating lever carrying a friction reducing roller at one end and adapted to engage as.

operative pump at the opposite end, an operating cam on said shaft normally engage-d by and operating said lever, a sleeve slidable on the shaft, a centrifugal governor actuating the sleeve, an annular Wedge element on said sleeve arranged to directly engage the roller on said lever, whereby under predetermined Working conditions said Wedge element directly engages the roller and moves the latter variable distances from the cam.

2. In combination, a drive shaft,a. pump actuating lever carrying a friction reducing roller at one end and adapted to engage an operative pump at the opposite end, an operating cam on said shaft normally engaged by and operating said lever, a sleeve slidable on the shaft, a centrifugal governor actuating the sleeve, an annular Wedge element on saidsleeve arranged to directly engage the roller on said lever, whereby under predetermined Working conditions said Wedge element directly engages the roller and moves the latter variable distances from the cam, and means normally tending to maintain the sleeve in spaced relation to the lever roller.

In testimony whereof I aflix my signature;

BROR ALGOR nn W'Al-ERN. 

